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Thu, 09 Jan 2020 23:29:44 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.27/8.16.0.27) with SMTP id 009NO7Bt063938; Thu, 9 Jan 2020 23:27:44 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by userp3030.oracle.com with ESMTP id 2xdms0aay4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 09 Jan 2020 23:27:43 +0000 Received: from abhmp0014.oracle.com (abhmp0014.oracle.com [141.146.116.20]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 009NReTB004699; Thu, 9 Jan 2020 23:27:40 GMT Received: from bostrovs-us.us.oracle.com (/10.152.32.65) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 09 Jan 2020 15:27:40 -0800 Subject: Re: [PATCH v1 2/4] x86/xen: add basic KASAN support for PV kernel To: Sergey Dyasli , xen-devel@lists.xen.org, kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , Juergen Gross , Stefano Stabellini , George Dunlap , Ross Lagerwall , Andrew Morton References: <20200108152100.7630-1-sergey.dyasli@citrix.com> <20200108152100.7630-3-sergey.dyasli@citrix.com> From: Boris Ostrovsky Message-ID: <5214cb54-1719-f93b-130f-90c5da31e22a@oracle.com> Date: Thu, 9 Jan 2020 18:27:38 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.0 MIME-Version: 1.0 In-Reply-To: <20200108152100.7630-3-sergey.dyasli@citrix.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9495 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1911140001 definitions=main-2001090195 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9495 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1911140001 definitions=main-2001090196 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 1/8/20 10:20 AM, Sergey Dyasli wrote: > @@ -1943,6 +1973,15 @@ void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn) > if (i && i < pgd_index(__START_KERNEL_map)) > init_top_pgt[i] = ((pgd_t *)xen_start_info->pt_base)[i]; > > +#ifdef CONFIG_KASAN > + /* > + * Copy KASAN mappings > + * ffffec0000000000 - fffffbffffffffff (=44 bits) kasan shadow memory (16TB) > + */ > + for (i = 0xec0 >> 3; i < 0xfc0 >> 3; i++) Are you referring here to  KASAN_SHADOW_START and KASAN_SHADOW_END? If so, can you use them instead? -boris > + init_top_pgt[i] = ((pgd_t *)xen_start_info->pt_base)[i]; > +#endif > + >